[Qemu-devel] bug (?) related to kqemu and/or Minix3

[Qemu-devel] bug (?) related to kqemu and/or Minix3

[Matej Kosik]

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Hello,

I (and others) have observed the following problem with kqemu

If you take Minix3 harddisk image such as:

	http://altair.sk/uploads/minix.img.gz

and if you try to boot it via QEMU without kqemu

	qemu -hda minix.img -no-kqemu

there are no problems.

	http://altair.sk/uploads/no-problem.png

However, if you do the same but you try to use kqemu

	qemu -hda minix.img

booting of the kernel halts in the middle.

	http://altair.sk/uploads/problem.png

Do you think that this is a bug in Minix or in kqemu module?

Best regards
- --
Matej
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Re: [Qemu-devel] bug (?) related to kqemu and/or Minix3

[Mulyadi Santosa]

Hi...

The screen capture didn't show anything suspicious...maybe the issue
is related to segmentation? Linux...AFAIK.... doesn't use CS segment
that much in GDT

regards,

Mulyadi

Re: [Qemu-devel] bug (?) related to kqemu and/or Minix3

[Matej Kosik]

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Mulyadi Santosa wrote:
> Hi...
> 
> The screen capture didn't show anything suspicious...maybe the issue
> is related to segmentation? Linux...AFAIK.... doesn't use CS segment
> that much in GDT

I do not know. What I was trying to say is that it is weird if Minix (note that I was not meaning
Linux) works fine:
- - on bare hardware
- - on QEMU (without kqemu)
but does not work on QEMU with kqemu. Minix developers say that it is bug somewhere in kqemu.

Bug in Minix is not relevant (to others) but if it revealed some bug in kqemu, this may be
interesting to other operating systems too.
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Re: [Qemu-devel] bug (?) related to kqemu and/or Minix3

[Mulyadi Santosa]

Hi..

On Wed, Feb 27, 2008 at 8:10 PM, Matej Kosik <kosik@fiit.stuba.sk> wrote:
>  I do not know. What I was trying to say is that it is weird if Minix (note that I was not meaning
>  Linux) works fine:
>  - - on bare hardware
>  - - on QEMU (without kqemu)
>  but does not work on QEMU with kqemu. Minix developers say that it is bug somewhere in kqemu.

Yup, I got your point. try to read kqemu technical document, there you
will see its technical limitation.

regards,

Mulyadi.